Air-spring



J. I. ISLER.

AIR SPRING. APPLICATION min ml. 2. 1920.

WITIIESSES INVENTOR A tfofi/rz award er ATTORNEYS 40 employed. The plunger 45 her having its upper 50 inside and outside of this Mom JOHN J. ISLER, F KIZPLING. MICHIGAN.

AIR-SPRIN Specification of Letters Patent.

Patented Apr. 26, 1921.

Application flied April 2, 1920. Serial No. 370,721.

to provide improved mounting for a pneumatic cushion which will entirely illtlOSG the cushion and which will permit the latter to freely function to absorb shocks and vibrations and gives resilient support in any posi tion in which it is used.

A further object is to provlde an improved construction and arrangement of easing which will be substantially watertight to prevent injury to the cushion through contact with atmospheric conditions.

l/Vith these and other objects in view the invention cons in certain novel features of construction, and coml'iinations and arrangements of parts as will be more fully hereinafter described and pointed out in the claims.

The accompanying drawing is a view in longitudinal section illustrating my invention.

1 represents a cylinder having a base 2 with a projection 1i thereon for attachment of the cylinder to any suitable mount. The other end of the cylinder is open and is pro vided adjacent its open end with external screw threads as shown at L 5 represents a plunger which fits within the cylinder 1 and is made with a rod 6 extending from the plunger any desired distuner and adapted to hefixed to the parts 5 is in the form of an inverted cup having a cylindrical recess 7 in its inner face to receive the upper end of an air cushion 8. This cushion 8 comprises a tubular rubber or other elastic mem end located in the recess 7 oi the plunger 5 and maintained in cylindrical form by means of a. disk or disks 9 around which the end of the cushion 8 is secured, and rings 10 and ii are positioned upper end of the cushion and all of the parts are secured together by 'any suitable adhesive, and I preferably employ a surfacing of wax or other material to fill all of the openings or spaces in the connection to prevent possibility of air leakage.

The disk 5) and the plunger 5 are made with an air inlet port 12 and a screw plug it! normally closes this port. When the plug is removed, air under any desired pressure may be admitted but under ordinary conditions atmospheric pressure or slight y exress thereof all that is necessary forthe cushion.

lhe lower end ot the cushion 8 is secured around a disk or disks i l and it will be noted that this disk 14 is of such size that it is necessary to expand or stretch the end of the cushion 8 to position the latter around the disk, and the combined diameter of the disk and the cushion is substantially the same diameter as the internal diameter of the cylinder 1..

By reason of this construction, the Wall of the cushion 8 is spaced from the inner face of the cylinder 1 throughout the greater portion of the length of the cushion, thus permitting the cushion to ally when compressed longitudinally without danger of cutting or otherwise injuring the cushion b' the movement of the plunger.

A cylindrical casing 15 constitutes an in- ('lUSHFG for the device and is made with in ternal screw threads 16 to engage the screw threads ll of cylinder 1 and permit the easing to be screwed downwardly upon the cylinder until the lower end of the casin tightly engages the base 2. The upper enc of the casing 15 is made with a bore 17 to receive the rod 6 and has a relatively close lit with the rod but permits longitudinal movement of the latter. When this casing 15 is in position as clearly shown, the pneu matic cushion 8 is protected from water or from other weather conditions and hence, the life of the device is greatly lengthened.

In operation, the plunger 5 moves longitudinally relative to the cylinder 1 and in this movement operates to compress the air in the cushion 8, the walls of the latter expanding transversely when compressed longitudinally and operating cushion to absorb shocks, jars, strains, etc.

Various slight changes might be made in the general form and arrangement of parts described without departing from the invention, and hence I do not limit myself to the precise details set forth but consider myas a pneumatic freely expand laterself at liberty to make such changes and alterations as fairly hill within the spirit and scope of the appcnihul claims.

I claim l. A device of the character stated, coniprisiugg i cylinder, u plunger in the cylinder, said plunger having a 'lindrical recess in its inner end, a cylindrical pl'icumatic cushion in the cylinder, one end of said cushion secured in the recess of the plunger, and a disk secured in the other end of the cushion, mid dish expanding the walls of the (insi er and holding the walls of the cushion 7: ontact with the inner face of the cylinder,

2. A device of the character stated, com-- prising;- a, cylinder, a plunger in the cylinder, said plunger having :1 cylindrical recess in its inner end a cylindrical pneumatic cushion in the cylinder. one end of said cushion secured in the recess of the 'ilungcr, a disk secured in the other end of the cushion, said disk expanding: the Walls of the cushion and holding the walls of the cushion in contact with the inner face of the cvlin der, and said cushion l eughont the greater ioution of its length having its walls spaced from the inner surfu of the cylinder.

3. A device of th arnctcr stated, com prising: a cylinder, 2: pr iger in thecyliruicr. said plunger having a uvlindz'icnl recess in its inner end, a cylindrical pneumatic cushion in the cylinder, one end of said cushion secured in the recess of the plungel, :1 disk secured in the other end of the cushion said disk expanding the wells of the cushion and holding the walls of the cushion in contact with the inner face of the c \'liuder, said cylinder having external screw threads, a cylindrical casing having internal screw threads engaging the threads of the cylinder, said casing inclosing the cylinder, a base on one end of the cylinder extending beyond the same and against which the open end of the casing engages, said (using having a longitudinal bore, and a stem on the plunger projecting through said bore.

4.. An air rushion, comprising an opencnded cylinder :1 plunger in the cylinder, a casing inclosirgf the cylinder,.suid plunger having a cylindrical. recess in its inner end, a cylindrical lastic member constitut ing an air. cushion disk in the upper end of said member, ria inside and outside of the said member a its upper end, said dish, snid rings and tin ,iper end of said member ecured in the re seed end of the plunger, :1 disk secured in sin lower end oi the plun er. said lirstmnniioned disk and plunger llLHlllgJj nu air inlet port, end a removable plus} norninlly in said port.

JOHN J. ISLER. 

